Kernel: Move the Storage directory to be a new directory under Devices

The Storage subsystem, like the Audio and HID subsystems, exposes Unix
device files (for example, in the /dev directory). To ensure consistency
across the repository, we should make the Storage subsystem to reside in
the Kernel/Devices directory like the two other mentioned subsystems.

Kernel/Devices/Storage/ATA/AHCI/InterruptHandler.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2021-2022, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <Kernel/Devices/Device.h>
+#include <Kernel/Devices/Storage/ATA/AHCI/Controller.h>
+#include <Kernel/Devices/Storage/ATA/AHCI/Port.h>
+#include <Kernel/Devices/Storage/StorageDevice.h>
+#include <Kernel/Interrupts/PCIIRQHandler.h>
+#include <Kernel/Library/LockRefPtr.h>
+#include <Kernel/Locking/Mutex.h>
+#include <Kernel/Memory/PhysicalPage.h>
+#include <Kernel/PhysicalAddress.h>
+#include <Kernel/Random.h>
+#include <Kernel/Sections.h>
+#include <Kernel/WaitQueue.h>
+
+namespace Kernel {
+
+class AsyncBlockDeviceRequest;
+
+class AHCIController;
+class AHCIPort;
+class AHCIInterruptHandler final : public PCIIRQHandler {
+    friend class AHCIController;
+
+public:
+    static ErrorOr<NonnullOwnPtr<AHCIInterruptHandler>> create(AHCIController&, u8 irq, AHCI::MaskedBitField taken_ports);
+    virtual ~AHCIInterruptHandler() override;
+
+    virtual StringView purpose() const override { return "SATA IRQ Handler"sv; }
+
+    bool is_responsible_for_port_index(u32 port_index) const { return m_taken_ports.is_set_at(port_index); }
+
+private:
+    AHCIInterruptHandler(AHCIController&, u8 irq, AHCI::MaskedBitField taken_ports);
+
+    void allocate_resources_and_initialize_ports();
+
+    //^ IRQHandler
+    virtual bool handle_irq(RegisterState const&) override;
+
+    enum class Direction : u8 {
+        Read,
+        Write,
+    };
+
+    AHCI::MaskedBitField create_pending_ports_interrupts_bitfield() const;
+
+    // Data members
+    NonnullLockRefPtr<AHCIController> m_parent_controller;
+    AHCI::MaskedBitField m_taken_ports;
+    AHCI::MaskedBitField m_pending_ports_interrupts;
+};
+}